At the risk of sounding pedantic, it’s Amanita muscaria subsp. flavivolvata, (aka Amanita amerimuscaria nom. prov.). Basically, the standard North American member of the Amanita muscaria complex, which generally starts out red and fades to more yellowish tones with age. Amanita muscaria var. guessowii is a northeastern US/eastern Canadian population that is deep yellow right from emergence.

True A. muscaria subsp. muscaria is a Eurasian species that ranges into Alaska. Somewhere around the middle of Alaska is the biogeographic divide between that and subsp. flavivolvata.